delegate.rb: ignore unset target

* lib/delegate.rb (Delegator#method_missing): ignore the target if not
  set, and delegate to global methods.  [ruby-core:58572] [Bug #9155]
* lib/delegate.rb (Delegator#respond_to_missing): ditto.
* lib/delegate.rb (SimpleDelegator#__getobj__): yield and return if
  not delegated but a block is given, like as Hash#fetch.
* lib/delegate.rb (DelegateClass#__getobj__): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43984 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 0 deletions

diff --git a/test/test_delegate.rb b/test/test_delegate.rb
index 58fefea608..ca65ef3daa 100644
--- a/test/test_delegate.rb
+++ b/test/test_delegate.rb
@@ -168,4 +168,16 @@ class TestDelegateClass < Test::Unit::TestCase
       d.__getobj__
     }
   end
+
+  class Bug9155 < DelegateClass(Integer)
+    def initialize(value)
+      super(Integer(value))
+    end
+  end
+
+  def test_global_method_if_no_target
+    bug9155 = '[ruby-core:58572] [Bug #9155]'
+    x = assert_nothing_raised(ArgumentError, bug9155) {break Bug9155.new(1)}
+    assert_equal(1, x.to_i, bug9155)
+  end
 end